Here is the result of running ADMIXTURE for K=6 using 275K SNPs on the combined HGDP+HapMap European populations + the CHB Chinese sample from HapMap. (Only the larger HapMap Tuscan sample was included, rather than the smaller HGDP one).
Using a large number of K in closely related populations makes convergence quite harder, but the end result does correspond to several identifiable clusters.
yellow: Northern European
light and dark blue: Chinese
It's interesting that the Chinese split before some Europeans do. Interestingly, one of the two Chinese components (light blue) is the one represented in Russians, so this split probably reflects some type of northern/southern differentiation in Chinese, as the east Eurasian component in Russians was introduced from northern Finno-Ugric speakers.
Here are the admixture proportions:
It would be interesting to add the Xing et al. dataset into the mix, however, there is little overlap between all three datasets, rendering the aggregate quite useless for such fine-level work.